We have a lemon tree that I planted about 5 years ago. It was a couple of years old when I planted it. About every 2 weeks I water it with Epsom salts. I fertilize it 3 -4 times a year. I trim it twice a year. It gives me about 30 lemons every year. The cold does affect the tree and any lemons on the tree but it has to be about 3 days in a row of frost. When it is smaller you can cover it when frost is predicted.
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